Riparian woodland occurs along permanent or semi-permanent lakes, ponds, rivers or streams, or in areas with a very shallow water table. Vegetation is characterized by medium to tall shrubs or trees which need consistent moisture and can withstand occasional periods of flood.

In the Reserve, most of our riparian woodland is dominated by arroyo willow, with occasional cottonwood and sycamores. Some areas have been invaded by eucalyptus and the Conservancy has an active eradication program. Extensive riparian vegetation occurs along Escondido Creek, but many of our riparian areas are small areas that are artificially maintained by freshwater run off from neighboring developments.